A (relatively) simple tool to replicate complex 2D motion with cranks and gears. It’s so smooth it made me sit upright so I could see the rotating ellipses better. The implications? You can 3D-print gears to create toys that move as naturally as you want them to. Yes, there’s a video demonstrating this.

And just for good measure, if you haven’t seen the game Disney Infinity, go take a look now. It’s probably unlike any video game you’ve seen before. (There’s Wikipedia, for those of you who want the quick read.)